1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
/*
* Copyright (C) 2008, 2009 Nokia Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Author: Artem Bityutskiy
*
* MTD library.
*/
#ifndef __LIBMTD_H__
#define __LIBMTD_H__
#ifdef __cplusplus
extern "C" {
#endif
/* Maximum MTD device name length */
#define MTD_NAME_MAX 127
/* Maximum MTD device type string length */
#define MTD_TYPE_MAX 64
/* MTD library descriptor */
typedef void * libmtd_t;
/**
* @mtd_dev_cnt: count of MTD devices in system
* @lowest_mtd_num: lowest MTD device number in system
* @highest_mtd_num: highest MTD device number in system
* @sysfs_supported: non-zero if sysfs is supported by MTD
*/
struct mtd_info
{
int mtd_dev_cnt;
int lowest_mtd_num;
int highest_mtd_num;
unsigned int sysfs_supported:1;
};
/**
* struct mtd_dev_info - information about an MTD device.
* @mtd_num: MTD device number
* @major: major number of corresponding character device
* @minor: minor number of corresponding character device
* @type: flash type (constants like %MTD_NANDFLASH defined in mtd-abi.h)
* @type_str: static R/O flash type string
* @name: device name
* @size: device size in bytes
* @eb_cnt: count of eraseblocks
* @eb_size: eraseblock size
* @min_io_size: minimum input/output unit size
* @subpage_size: sub-page size
* @oob_size: OOB size (zero if the device does not have OOB area)
* @region_cnt: count of additional erase regions
* @writable: zero if the device is read-only
* @bb_allowed: non-zero if the MTD device may have bad eraseblocks
*/
struct mtd_dev_info
{
int mtd_num;
int major;
int minor;
int type;
const char type_str[MTD_TYPE_MAX + 1];
const char name[MTD_NAME_MAX + 1];
long long size;
int eb_cnt;
int eb_size;
int min_io_size;
int subpage_size;
int oob_size;
int region_cnt;
unsigned int writable:1;
unsigned int bb_allowed:1;
};
/**
* libmtd_open - open MTD library.
*
* This function initializes and opens the MTD library and returns MTD library
* descriptor in case of success and %NULL in case of failure. In case of
* failure, errno contains zero if MTD is not present in the system, or
* contains the error code if a real error happened.
*/
libmtd_t libmtd_open(void);
/**
* libmtd_close - close MTD library.
* @desc: MTD library descriptor
*/
void libmtd_close(libmtd_t desc);
/**
* mtd_get_info - get general MTD information.
* @desc: MTD library descriptor
* @info: the MTD device information is returned here
*
* This function fills the passed @info object with general MTD information and
* returns %0 in case of success and %-1 in case of failure. If MTD subsystem is
* not present in the system, errno is set to @ENODEV.
*/
int mtd_get_info(libmtd_t desc, struct mtd_info *info);
/**
* mtd_get_dev_info - get information about an MTD device.
* @desc: MTD library descriptor
* @node: name of the MTD device node
* @mtd: the MTD device information is returned here
*
* This function gets information about MTD device defined by the @node device
* node file and saves this information in the @mtd object. Returns %0 in case
* of success and %-1 in case of failure. If MTD subsystem is not present in the
* system, or the MTD device does not exist, errno is set to @ENODEV.
*/
int mtd_get_dev_info(libmtd_t desc, const char *node, struct mtd_dev_info *mtd);
/**
* mtd_get_dev_info1 - get information about an MTD device.
* @desc: MTD library descriptor
* @mtd_num: MTD device number to fetch information about
* @mtd: the MTD device information is returned here
*
* This function is identical to 'mtd_get_dev_info()' except that it accepts
* MTD device number, not MTD character device.
*/
int mtd_get_dev_info1(libmtd_t desc, int mtd_num, struct mtd_dev_info *mtd);
/**
* mtd_erase - erase an eraseblock.
* @desc: MTD library descriptor
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to erase
*
* This function erases eraseblock @eb of MTD device described by @fd. Returns
* %0 in case of success and %-1 in case of failure.
*/
int mtd_erase(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, int eb);
/**
* mtd_torture - torture an eraseblock.
* @desc: MTD library descriptor
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to torture
*
* This function tortures eraseblock @eb. Returns %0 in case of success and %-1
* in case of failure.
*/
int mtd_torture(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, int eb);
/**
* mtd_is_bad - check if eraseblock is bad.
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to check
*
* This function checks if eraseblock @eb is bad. Returns %0 if not, %1 if yes,
* and %-1 in case of failure.
*/
int mtd_is_bad(const struct mtd_dev_info *mtd, int fd, int eb);
/**
* mtd_mark_bad - mark an eraseblock as bad.
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to mark as bad
*
* This function marks eraseblock @eb as bad. Returns %0 in case of success and
* %-1 in case of failure.
*/
int mtd_mark_bad(const struct mtd_dev_info *mtd, int fd, int eb);
/**
* mtd_read - read data from an MTD device.
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to read from
* @offs: offset withing the eraseblock to read from
* @buf: buffer to read data to
* @len: how many bytes to read
*
* This function reads @len bytes of data from eraseblock @eb and offset @offs
* of the MTD device defined by @mtd and stores the read data at buffer @buf.
* Returns %0 in case of success and %-1 in case of failure.
*/
int mtd_read(const struct mtd_dev_info *mtd, int fd, int eb, int offs,
void *buf, int len);
/**
* mtd_write - write data to an MTD device.
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to write to
* @offs: offset withing the eraseblock to write to
* @buf: buffer to write
* @len: how many bytes to write
*
* This function writes @len bytes of data to eraseblock @eb and offset @offs
* of the MTD device defined by @mtd. Returns %0 in case of success and %-1 in
* case of failure.
*/
int mtd_write(const struct mtd_dev_info *mtd, int fd, int eb, int offs,
void *buf, int len);
/**
* mtd_write_img - write a file to MTD device.
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to write to
* @offs: offset withing the eraseblock to write to
* @img_name: the file to write
*
* This function writes an image @img_name the MTD device defined by @mtd. @eb
* and @offs are the starting eraseblock and offset on the MTD device. Returns
* %0 in case of success and %-1 in case of failure.
*/
int mtd_write_img(const struct mtd_dev_info *mtd, int fd, int eb, int offs,
const char *img_name);
/**
* mtd_probe_node - test MTD node.
* @desc: MTD library descriptor
* @node: the node to test
*
* This function tests whether @node is an MTD device node and returns %1 if it
* is, and %-1 if it is not (errno is ENODEV in this case) or if an error
* occurred.
*/
int mtd_probe_node(libmtd_t desc, const char *node);
#ifdef __cplusplus
}
#endif
#endif /* __LIBMTD_H__ */
|
